content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------
   * ChartSelection.java
   * -------------------
   * (C) Copyright 2009, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 08-Apr-2009 : Version 1, with inspiration from patch 1460845 (DG);
   * 05-May-2009 : Match the scaling options provided by the ChartPanel
   *               class (DG);
   *
   */
  
  package org.jfree.chart;
  
  import java.awt.Graphics2D;
  import java.awt.datatransfer.DataFlavor;
  import java.awt.datatransfer.Transferable;
  import java.awt.datatransfer.UnsupportedFlavorException;
  import java.awt.geom.AffineTransform;
  import java.awt.geom.Rectangle2D;
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  
  /**
   * A class used to represent a chart on the clipboard.
   *
   * @since 1.0.13
   */
  public class ChartTransferable implements Transferable {
  
      /** The data flavor. */
      final DataFlavor imageFlavor = new DataFlavor(
              "image/x-java-image; class=java.awt.Image", "Image");
  
      /** The chart. */
      private JFreeChart chart;
  
      /** The width of the chart on the clipboard. */
      private int width;
  
      /** The height of the chart on the clipboard. */
      private int height;
  
      /**
       * The smallest width at which the chart will be drawn (if necessary, the
       * chart will then be scaled down to fit the requested width).
       *
       * @since 1.0.14
       */
      private int minDrawWidth;
  
      /**
       * The smallest height at which the chart will be drawn (if necessary, the
       * chart will then be scaled down to fit the requested height).
       *
       * @since 1.0.14
       */
      private int minDrawHeight;
  
      /**
       * The largest width at which the chart will be drawn (if necessary, the
       * chart will then be scaled up to fit the requested width).
       *
       * @since 1.0.14
       */
      private int maxDrawWidth;
  
      /**
       * The largest height at which the chart will be drawn (if necessary, the
       * chart will then be scaled up to fit the requested height).
       *
       * @since 1.0.14
       */
      private int maxDrawHeight;
  
      /**
       * Creates a new chart selection.
       *
       * @param chart  the chart.
       * @param width  the chart width.
       * @param height  the chart height.
       */
      public ChartTransferable(JFreeChart chart, int width, int height) {
          this(chart, width, height, true);
      }
  
      /**
       * Creates a new chart selection.
       *
       * @param chart  the chart.
       * @param width  the chart width.
       * @param height  the chart height.
       * @param cloneData  clone the dataset(s)?
       */
      public ChartTransferable(JFreeChart chart, int width, int height,
              boolean cloneData) {
          this(chart, width, height, 0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE,
                  true);
      }
  
      /**
       * Creates a new chart selection.  The minimum and maximum drawing
       * dimensions are used to match the scaling behaviour in the
       * {@link ChartPanel} class.
       *
       * @param chart  the chart.
       * @param width  the chart width.
       * @param height  the chart height.
       * @param minDrawW  the minimum drawing width.
       * @param minDrawH  the minimum drawing height.
       * @param maxDrawW  the maximum drawing width.
       * @param maxDrawH  the maximum drawing height.
       * @param cloneData  clone the dataset(s)?
       *
       * @since 1.0.14
       */
      public ChartTransferable(JFreeChart chart, int width, int height,
              int minDrawW, int minDrawH, int maxDrawW, int maxDrawH,
              boolean cloneData) {
  
          // we clone the chart because presumably there can be some delay
          // between putting this instance on the system clipboard and
          // actually having the getTransferData() method called...
          try {
              this.chart = (JFreeChart) chart.clone();
          }
          catch (CloneNotSupportedException e) {
              this.chart = chart;
          }
          // FIXME: we've cloned the chart, but the dataset(s) aren't cloned
          // and we should do that
          this.width = width;
          this.height = height;
          this.minDrawWidth = minDrawW;
          this.minDrawHeight = minDrawH;
          this.maxDrawWidth = maxDrawW;
          this.maxDrawHeight = maxDrawH;
      }
  
      /**
       * Returns the data flavors supported.
       *
       * @return The data flavors supported.
       */
      @Override
      public DataFlavor[] getTransferDataFlavors() {
          return new DataFlavor[] {this.imageFlavor};
      }
  
      /**
       * Returns <code>true</code> if the specified flavor is supported.
       *
       * @param flavor  the flavor.
       *
       * @return A boolean.
       */
      @Override
      public boolean isDataFlavorSupported(DataFlavor flavor) {
          return this.imageFlavor.equals(flavor);
      }
  
      /**
       * Returns the content for the requested flavor, if it is supported.
       *
       * @param flavor  the requested flavor.
       *
       * @return The content.
       *
       * @throws java.awt.datatransfer.UnsupportedFlavorException
       * @throws java.io.IOException
       */
      @Override
      public Object getTransferData(DataFlavor flavor)
              throws UnsupportedFlavorException, IOException {
  
          if (this.imageFlavor.equals(flavor)) {
              return createBufferedImage(this.chart, this.width, this.height,
                      this.minDrawWidth, this.minDrawHeight, this.maxDrawWidth,
                      this.maxDrawHeight);
          }
          else {
              throw new UnsupportedFlavorException(flavor);
          }
      }
  
      /**
       * A utility method that creates an image of a chart, with scaling.
       *
       * @param chart  the chart.
       * @param w  the image width.
       * @param h  the image height.
       * @param minDrawW  the minimum width for chart drawing.
       * @param minDrawH  the minimum height for chart drawing.
       * @param maxDrawW  the maximum width for chart drawing.
       * @param maxDrawH  the maximum height for chart drawing.
       *
       * @return  A chart image.
       *
       * @since 1.0.14
       */
      private BufferedImage createBufferedImage(JFreeChart chart, int w, int h,
              int minDrawW, int minDrawH, int maxDrawW, int maxDrawH) {
  
          BufferedImage image = new BufferedImage(w, h,
                  BufferedImage.TYPE_INT_ARGB);
          Graphics2D g2 = image.createGraphics();
  
          // work out if scaling is required...
          boolean scale = false;
          double drawWidth = w;
          double drawHeight = h;
          double scaleX = 1.0;
          double scaleY = 1.0;
          if (drawWidth < minDrawW) {
              scaleX = drawWidth / minDrawW;
              drawWidth = minDrawW;
              scale = true;
          }
          else if (drawWidth > maxDrawW) {
              scaleX = drawWidth / maxDrawW;
              drawWidth = maxDrawW;
              scale = true;
          }
          if (drawHeight < minDrawH) {
              scaleY = drawHeight / minDrawH;
              drawHeight = minDrawH;
              scale = true;
          }
          else if (drawHeight > maxDrawH) {
              scaleY = drawHeight / maxDrawH;
              drawHeight = maxDrawH;
              scale = true;
          }
  
          Rectangle2D chartArea = new Rectangle2D.Double(0.0, 0.0, drawWidth,
                  drawHeight);
          if (scale) {
              AffineTransform st = AffineTransform.getScaleInstance(scaleX,
                      scaleY);
              g2.transform(st);
          }
          chart.draw(g2, chartArea, null, null);
          g2.dispose();
          return image;
  
      }
  
  }
  